How to Write the Formula for Phosphorus pentoxide Diphosphorus pentoxide

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In this video we'll write the correct formula for Phosphorus pentoxide, also called Diphosphorus pentoxide. • This one is tricky because the name doesn't' tell you the correct formula. The empirical formula is P2O5, which was the first thing discovered by chemists. Later it was realized that the actual formula was double the empirical and the correct formula for the molecule is P4O10. • So when chemists say Phosphorus pentoxide they are referring to P4O10. • To write the formula for Phosphorous pentoxide (Diphosphorous pentoxide) we can think of it at Tetraphosphorous decoxide and we’ll use the Periodic Table and follow some simple rules. • When we have a non-metal and a non-metal we have a molecular compound (sometimes called covalent). Molecular compounds are some of the simplest to name. • Keys for Writing the Formulas for Molecular Compounds: • Write the element symbol for both elements. • Place a subscript after each element according to its prefix. • Note: Don’t write the subscript '1'. • --------- • Prefixes • mono- 1 • di- 2 • tri- 3 • tetra- 4 • penta- 5 • hexa- 6 • hepta- 7 • octa- 8 • nona- 9 • deca- 10 • --------- • Caution: We only write mono for the second element in a molecular compound. So CO would be carbon monoxide. Monocarbon monooxide is incorrect. • For a complete tutorial on naming and formula writing for compounds, like Phosphorous pentoxide (Diphosphorous pentoxide) and more, visit: • http://www.breslyn.org/chemistry/naming • Drawing/writing done in InkScape (https://www.InkScape.org). Screen capture done with Camtasia Studio 4.0. Created on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).

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